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Diversity in the Northern Seed Sources of Loblolly Pine

Nine seed sources of Loblolly pine ( Pinus taeda) from the northern parts of its range (Maryland and Delaware) and two commercial seed lots were studied in a tree nursery and in Coastal, Piedmont, and Appalachian plantations of Maryland. Significant variations were found in speed of germination, cotyledon-number, bud-set, secondary growth, straightness of seedlings, height in the nursery, and height and survival at age of 11 to 15 years in the field. Trees from commercial seed lots and from Chincoteague Island grew slowly. Four of five sources from Maryland's Eastern Shore had 5% to 8% larger heights than the mean heights of all sources. At the coldest research site (Allegany County, MD), survival was significantly correlated with the latitude of the seed source (r = 0.73).


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Author(s): John. B Genys

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1985